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The M4 Platform contains four unlockable weapons: FTAC Recon, 556 Icarus, M16, and FSS Hurricane. To unlock each of these, you have to use and level different weapons within the M4 Platform. By levelling the M4 to levels 13 and 18, you'll unlock the FTAC Recon and 556 Icarus respectively.
It is well-rounded with a fast fire rate, great TTK, and easy-to-control recoil. It truly is the weapon you pick when you want a primary that covers just about every scenario.